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Plant Energy Balance

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Plant Energy Balance

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  1. Plant Energy Balance

  2. Effective Energy Management • Develop baseline • Utility analysis • Plant energy balance • Lean energy analysis (LEA) • Take action • Identify and quantify energy saving opportunities • Prioritize energy saving opportunities • Implement energy saving opportunities • Measure and benchmark to sustain efforts • Develop metrics for system energy efficiency • Measure energy efficiency improvement with sliding NAC • Compare energy efficiency between facilities with NAC

  3. Plant Energy Balance • Energy Balance: Ein – Eout = DEstored • Plant Energy Balance: Where does Ein go? • In some cases, detailed sub-metered data may be available. • However, a useful approximation can be derived from the method that follows. • This chapter shows how to calibrate approximate the energy use by equipment against total energy input using the energy balance concept. • This information is helpful in • focusing efforts on large energy users • calibrating engineering models of equipment Ein E,out

  4. Efficiency • Pinput – Plost – Puseful,output = 0 • Energy efficiency is defined as the ratio of useful power output to total power input. • Efficiency = Puseful,output / Pinput Plost Pin Puseful,out • Many pieces of energy using equipment are rated by energy or power output. Thus, energy input is: • Einput = Euseful,output / Efficiency

  5. Electricity Energy Balance:Data Supplied By Facility

  6. Electricity Energy Balance Example: E = 10 motors x 40 hp/motor x 50% / 90% x 4,000 hr/yr x 0.746 kW/hp E = 663,111 kWh/yr

  7. Electricity Energy Balance:Sorted from Highest to Lowest

  8. Fuel Energy Balance:Data Supplied By Facility

  9. Fuel Energy Balance Example: E = 2 boilers x 3 mmBtu/hr-boiler x 80% x 6,000 hr/yr / 80% E = 36,000 mmBtu/yr

  10. Fuel Energy Balance:Sorted from Highest to Lowest